Oil trap



March 26, 1929. 4 0, G ANDERSON l .f 1,706,990

on. TRAP Filed June 25, 1926 ljj.

Patented Mar. 26, 1929.

UNITED STATES `OSCAR Gr. ANDERSON, F MARQUETTE, MICHIGAN. i

OIL TRAP.

l Application filed .Tune 25, 1926. Serial No. 118,471.

The purpose oil2 thisinvention is to provide improved means 'lor separating lubricating oil employed in a gas or vapor compressing` machine from the gas or vapor handled by the 5 machine. lt consists in certain features and elements of construction in combination, as heroin shown and described, and as indicated iby the claims.

ln the drawings:

Figure 1 is a side elevation of a compressor shown partly in section and having connected therewith an oil Vtrap embodying thisinvention and shown wholly in vertical axial scction.

Figure 2 is a sectional view similar to Fig. 1, showing the lower portion oli the oil trap during the process of en'iptying.

TEer purposes of illustration and description this invention may be understood as aping system. Such a compressor is conventionally shown as having a cylinder, f1, provided with a piston, 2, crank case, 3, and Hy wheel, a. Attached to the head, 5, of the cyl; inder, 1, is a valve litting, 6, which may be une derstood as containing inlet and outlet valves communicating respectively with the inlet pipe, 7, and outlet pipe, 8.` The refrigerant used in the system comes to the compressor through the pipe, 7, in the form of a and is compr :sed and delivered through the outlet pipe, S. Unavoidably a certain portion of the lubricating oil employed in the machine becomes admired with the gas leaving through the outlet, tl, and. it is desirable to recover this` oil vfrom the gas both lor the sake o'l economy .in lubrication cost and to avoid trmible in the systen'i which .might arise from the presence oli the oil, pari ticularly when the reir' nfant reaches such Y low teu'iperatures as might cause the lubricant to congeal and gum other working parts ot the cooking apparatus.

ffl

rll1 o accomplisu the separation oi 'the oil I lead the compress-red gas trom the outlet, 8, through a trapping chamber, 9, having a depending baille "all, 10, disposed between the inlet port, 11, ot the chamber and the outlet port, 12, both ot these being located in the upper portion ol the chamber. rThis battle wall causes the which enters at the inlet, 1l, to suddenly change its direction of liow, and as the impinges against the baille, 10, the oil vapor which it carries tends to condense upon the baffle Wall and drip oli the CII l plied to the compressing unit o1 a relrigcrat` lower edge thereof while the gas itself iills the l chamber, 9, and escapes through the outlet, 1Q. The oil dripping` from the baille, 10, accumulates in a pool, 13, in the lower portion ofthe chamber, 9. While the compressor is running the pressure in the cylinder, 1, is normally higher than that in the crank case, 3, but in practically all relirigerating systems the operation or the compressor is intermittent and when the piston, 2, stops moving the gas which is trapped under pressure above the piston in the system tends to absorb heat and expand and then leak past the sealing rings, 14, raising the pressure in the crank case, 3. Thus during the period oi' suspended operation the crank case pressure practically certain to rise to a value higher than atmospheric pressure.

In the bottomof thc trapping chamber, 9, a normally closedvalve, '15, controls a port, 16, which leads by way ot a passage, 17, into the crank case, 3. Another passage, 18, provides communication between the crank rase,

3, and the interior oi an expansible chamber or bellows, 19, oli the corrugated metal, type, and the upper wall, 20, ol." this chamber is positively connected to the stem, 21, of the valve, 15. Thus the increase ot pressure in the crank case, 3, tends to cause expansion oi the bellows, 19, lifting the valve, 15,1rom its seat and allowing the accumulation of oil at 15:5, to flow through the port, 16,-and passage, 1T, bark into the crank fase. A spring, 22, reacting against the top 'all-9.0, of the bel lov. seats the valve, 15, with a predetermined pressu re which ot course must be overcome by the crank case {n'essurc bciore the bellows, 19, will .expand to open 'the valve.

As a convenient construction, the base ot the chaniber, 9, is formed as a casting, 23, providing a space, 24:, vented. to the atmosphere, for housing the bellows, 19, and packing is-in sorted at 25 around the stem, 21, oi the valve, 15, to prevent leakage of oil into the space, 24.

1. an oil separator :tor a gas-compressor oit the piston and cylinder type, comprising a delivery conduit leading from the cylinder of the compressor, an oil trapping chamber having in its upper portion an inlet port and an outlet port for gas, the inlet be ing connected to said delivery conduit, a

,baille wall in the chamber between the inlet and the outlet arranged with a space below the baille to receive oil dripping therefrom, a passage leading from said space to the Y crank easeV of the, compressoix,A a normallyclosedvalve controlling said passage and: pressure responsive means connected tor opening said valve upon-increase oi pressure*insaid'r crank case.

2. Anvoil sepa 'ator for a gas-compressonaf the piston and cylinder type, comprising a delivery conduit leading .from thecylinder ofthe compressor, an oil trap `ing chamber having m itscupper-portion an inletI port'and anioutl-et portforgas, the inlet being connect;- ed tosaid delivery conduit, a lbaille wall in the chamber between'the inlet and the outlet arranged witha space below the baille to receive oil dripping therefrom7 a passage leading Voutlet port lfor gas,t,he inlet being connected to said ydelivery cond,uit,a baiiie lwall in the chamber between the inlet andthe outlet arrangedwith a space below the baiile to receive oil" dripping therefrom', a passage lead-ing from` lsaid space to the crank` ease oi the corn.- pressor, a` valve controlling saidy passage, an

expansible chamber subjected eXteriorl-y to atmospheric pressure andinteriorly connected withuthe crank case, said chamber being, `connected with the valve for actuating the,

same when pressure in the crank case expands the chamber.

4. In: thefcombination definedA inclaiin 3, a

spring disposed for normally seating the valve'.W i

5. An oil separator for a gas-compressor of the piston and cylinder type, comprisingr a dlivljy Qqnduit leading from the cylinder of the compressor, an oil trapping chamber having-in its upper portion an inlet port and an outlet port for gas, the inlet being connected to said delivery conduit, a bailie wall in the chamber between the inlet and the outlet ar- "angedl with a space below the baille to rccei've oil dripping therefrom, a receiving chamber below said space, a port atiording communication between the two clmmhcrs, a normally closed valve at said port having: a stem passing throughithc receiving chamber and its opposite wall with means for packing said stem; and mechanism outside the receiving chamber responsive to pressure in the crank case of the compressor and connected for opening the valve upon increase of said pressure.

6'. In the combination defined in claim 3, said expansible chamber having a pressure actuating area several times greater than that of said valve, whereby said valve is caused to be actuated when the pressurc in the crank case is less than the pressure in the oil trapping chamber.

7.' In the combination defined in claim 3, said expansiblje chamber having a pressure actuating area greater than that of said va lve, and a spring co-operating with said expansible chamber whereby t0 permit actuation of said valve only whenthe pressure in the crank case has reached a predetermined amount.

In testimony whereof. I have hereunto sety my hand at Chicago, Illinois, this llth day of June,y 1926;

' OSCAR G. ANDERSON. 

